9ccbbda6ac
MIR printing: print the path of uneval'd const
Currently it just prints `const _` which makes it impossible to say which constant is being referred to.
Also refer to promoteds in a consistent way; previously MIR printing would do
```
promoted[0] in C1: &Option<Cell<i32>> = {
// ...
}
```
Now that should be
```
const C1::promoted[0]: &Option<Cell<i32>> = {
// ...
}
```
We don't seem to have a test for that so I tried it by hand, it seems to work:
```
const main::promoted[12]: &[&str; 3] = {
let mut _0: &[&str; 3];
let mut _1: [&str; 3];
let mut _2: &str;
let mut _3: &str;
let mut _4: &str;
let mut _5: &str;
bb0: {
_3 = const "b";
_2 = &(*_3);
_5 = const "c";
_4 = &(*_5);
_1 = [const "a", move _2, move _4];
_0 = &_1;
return;
}
}
```
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